Regulator for dynamo-electric machines



(No Model.)

B. THOMSON. REGULATOR POR DYNAMO BLBGTRIG MACHINES. No. 354,273. vPatented Deo. 14:, 1886.

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UNITED' STATES PATENT OFFICE.,

ELIHU THOMSON, OF LYNN, MASSACHUSETTS.

REGULATOR FOR DYNAMO-ELECTRlC-KMACHINES.

SPECIFICATION forming part of Letters Patent No. 354,273, dated December 14, 1886.

Serial No. 161,636. (No model.)

To all whom if; 'may concern:

Be it known that l, ELIHU Tr-rorrsoN, a citizen of the United States, and a resident of Lynn, in the county ol" Essex and State of Mas sach usetts, have invented certain new and useful Improvements in Regulators for Dynamo- Electric Machines, of which the following is a speciiieation.

The object of my invention is to automatic ally control the current generated and supplied by a dynamoelectric machine.

My invention consists in the specific improvements and combinations of devices, that will be described in connection with the accompanying drawings, and will then be stated in the claims.

In Figure 1 of the accompanying drawings l have illustrated diagrammatieally the application ot' my invention to an adjustable commutator. Fig. 2 shows a detail of the arrangement shown in Fig. l.

In Fic'. l, O is an axial 1nagnet-coil or solenoid, whose core, when attracted with a certain force against its own weight, or the force of a retractile spring, S, closes a contact at K, which eontactwhen closed permits the current from the circuit to pass in part through a magnet-coil, M, whose armature N then moves the lever L, so that the brushes B B may be set around the commutator V of a generator, to counteract the ettects of the current acting in C, so as to close contacts at K by causing a general weakening ot' the current in the eir cuit ofthe lights L L and the tieldeoils F F, when included in circuit. The coil O is always in the circuit, and might be replaced by one of the tieldcoils, when such are used in circuit, by providing a movable contact-closer operated by the variations in the strength thereof. There is a permanent resistance, R, around M and the contacts K, whose amount is preferably superior to that of M itself and the contacts.

In case of any decrease or increase ot current in the circuit, the magnet-coil C opens or closes the contact at K,'throwing out of or in circuit the magnet M, which latter drops or raises the armature N, as the case may be, and so sets the brushes B B to increase or diminish the current in the circuit. The practical result is the `preservation of nearly a standard current in the circuit. The magnet M, to avoid spark at K, is preferably surrounded by a thick copper tube or closed circuit of copper, b, Fie. 2, and the contacts K may havein addition a condenser, J, arranged in a branch around them. The resistance R is preferably of straight rods of high-resistance material, as carbon, and without much length or self-induction. This resistance, as indicated, consists of parallel conductors `connected into the circuit around the contacts. lVhen made ol' straight carbon rods, it is con strueted in any suitable Way for connecting Aa series of said rods into circuit with one another. Artificial resistances of this kind made from ordinary electric-light pencils are common in the art. lt is quite apparent that any other artificial resistance could be used in place of that just described.

The devices of Fig. l may be used as means of varying resistaneensuch as a shunt around the field-magnet coils ofthe machine, or a resistance in the yheld-circuit ofthe machineand the magnetcoil O may be included. either in circuit, as Where a constant current is to be maintained, or in a shunt from the positive to negative main, where a constant difference of potential is to be maintained.

What I claim as my invention isl. The combination, substantially as described, of an adjustable eommutator, a motor electro-magnet whose armature is connected with the .movable yoke for the brushes, a controller-magnet, a contact governed thereby and placed in a branch including the motormagnet, a retracter normally tending to keep the contact open againstthe power ot' the controllingmagnet, and a branch around the conktact and motor-magnet, including an artiiicial resistance.

2. The combination, substantially such as deseribed,of a controller-magnet, two branches ofthe main circuit, controller-contacts placed in one of said branches with the motor-magnet, an artificial resistance in the other branch, a closed conducting-band ou the motor-magnet, and a condenser in a shunt around the controllercontacts, as and for the purpose described.

Signed at Lynn, in the county of Essex and State of Massachusetts, this 6th day of April, A. D. 1885.

ELU-IU THOMSON. Witnesses:

E. H. KITFIELD, E, WILBUR Rien, Jr,

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